Not quite packet radio, but there’s a huge community for FT8 (very very limited communications bandwidth), there’s also JS8Call, but it’s sort of slow right now (on 20m at least). You might be interested in SSTV; there are various bands of activity, some on 20m (14.230Mhz and 14.233Mhz) and certainly other bands as well. The advantage of SSTV is that the more popular platforms (MMSSTV, BlackCat SSTV, and fldigi) can take audio input from your sound card and convert it to the SSTV broadcast.
Pair that up with any WebSDR and you can get nearly any broadcast within reach of your browser and the WebSDR in question.